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인치범(C.B.In),김상호(S.H.Kim),조원석(W.S.Cho) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_1
To develope oxidation catalysts for diesel vehicles the effects of precious metals and additives on the removal of PM(particulate matter) were investigated. The precious metals studied were Pt and seventeen kinds of additives were used. From synthetic gas tests, the influence of the important catalyst design parameters on catalytic performance of gaseous emissions and PM was evaluated. 'The experimental results showed that the most effective additives on the suppression of the sulfate formation were V₂O_5and Cr₂O₃. Catalytic performance was greatly changed by mutual loading amounts of precious metals and additives. Pt30 catalyst(Pt loading : 30 g/ft3) containing V₂O_5 of 1 g/ℓ revealed the best selective oxidation performance.<br/>
김창대(C.D.Kim),인치범(C.B.In),김상호(S.H.Kim),조원석(W.S.Cho) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_1
The NOx-storage component design parameters of NOx-storage-reduction catalyst for the GDI engine were investigated. It was reported that NOx adsorption catalyst has an weak thermal stability with NOx-storage component To solve this problem, the optimization of lithium and barium that roll on NOx-storage is needed. When a lithium(O.lmol) and barium(12wt%) on alumina(lmol) impregnated, the thermal stability of the support improved. The addition of a lithium on alumina suppressed the formation of barium aluminum oxide due to interaction between barium oxide and alumina. Also, the possibility of sintering between barium oxide and support became high as the barium concentration was increased. The optimum condition is lithium O.lmol, barium 12wt%. The NOx removal activity of the prepared catalyst in this study was 80% at 250°C.<br/>
김상호(S.H.Kim),김창대(C.D.Kim),인치범(C.B.In),조원석(W.S.Cho) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_1
Zeolite catalyst which can remove NOx through all lean combustion range was studied. Effects of metal ion exchange and the fraction of zeolite in the washcoat on the conversion and heat resistance of catalyst were investigated. Copper, Platium, Rhodium and some kinds of co-exchange metals were ion exchanged. Copper ion exchanged zeolite showed better NO conversion than Pt zeolite, but Pt zeolite maintained its zeolite structure even at higher aging temperature. As the fraction of zeolite in washcoat was increased catalysts conversion improved specially in Pt catayst. but it made more difficult to obtain adhesive coatings. Co-cation exchanging improved the heat resistance of catalyst, and consequently gave higher NO conversion efficiency after aging.<br/>